Europe's first geostationary sounder satellite is launched

> MTG-S1 is the first geostationary meteorological sounder satellite to fly over Europe

I was confused for a minute on how it's both _geostationary_ and _over Europe_ -- you can't be geostationary if your orbit is not over the equator!

Turns out[1] the MTG-S1 satellite is in fact geostationary and parked at exactly 0°00'00"N 0°00'00"E (off the coast of Ghana), 42164 km up from the center of Earth, it's just pointing at Europe at an angle.

1 - https://space.oscar.wmo.int/satellites/view/mtg_s1

NOAA/NASA (USA), EUMETSAT (European organization), JMA (Japan), KMA (Korea), and CMA (China) all have a geostationary satellite (one or more actually). So, northern hemisphere countries, but the coverage is global thanks to the fact that you need to be, as you say, above the equator.

I had doubts about the "parked at exactly 0°00'00"N 0°00'00"E", thinking it was over Null Island just because the data wasn't updated yet and it was showing uninitialized values.

But you are right, [1] confirms "0° longitude".

[1] https://user.eumetsat.int/resources/user-guides/mtg-in-opera...

I am surprised they would pick 0 for the latitude, it seems that most of Europe, whether it's the land or the people is east of that. Maybe some important weather systems develop over the Atlantic and they want to track that?

It’s exactly that. In fact, information propagates along with the winds. If you don’t observe upstream, you instead propagate an information hole. Each new model run incorporates the output of the previous run to preserve sparse weather information. It’s not that there are few observations, it’s that Earth is really big.

That specifies its position to about 30 metres of precision.

Presumably it's an intentional choice to put it at such a round number, rather than any scientific benefit over it being, say, 10km west or east.

0°00'00"N 0°00'00"E the country where all the scammer live